CN214747208U

CN214747208U - Reduce nitrogen oxide's apparatus for producing

Info

Publication number: CN214747208U
Application number: CN202120076893.3U
Authority: CN
Inventors: 曹万秋; 李志国; 姜跃华; 尹德明
Original assignee: Shenyang Aluminium And Magnesium Engineering And Research Institute Co Ltd
Current assignee: Shenyang Aluminium And Magnesium Engineering And Research Institute Co Ltd; Shenyang Aluminum and Magnesium Engineering and Research Institute Co Ltd
Priority date: 2021-01-13
Filing date: 2021-01-13
Publication date: 2021-11-16
Anticipated expiration: 2031-01-13

Abstract

The utility model relates to a can be used to boiler and roaster furnace's reduction nitrogen oxide's production device. The device comprises a cooling separator, a preheating separator, a smoke exhaust pipeline and a roasting main furnace, wherein the upper part of the roasting main furnace is connected with the preheating separator through a first pipeline, smoke after the roasting main furnace burns enters the preheating separator, the cooling separator is connected with the roasting main furnace through a combustion air pipeline, heat exchange combustion air from the cooling separator is connected to the bottom of the roasting main furnace through the combustion air pipeline, a first branch is arranged on the combustion air pipeline, the first branch introduces the combustion air into the upper part of the roasting main furnace, a second branch is arranged on the smoke exhaust pipeline, and the smoke is delivered into the combustion air pipeline below the roasting main furnace through the second branch. The utility model discloses can effectively reduce calcination main furnace temperature, reduce NOx's production, reach the purpose of environmental protection.

Description

Reduce nitrogen oxide's apparatus for producing

Technical Field

The utility model relates to a produce the device, especially relate to a can be used to the boiler and bake burning furnace's reduction nitrogen oxide's production device over a slow fire.

Background

In the production process of alumina, an aluminum hydroxide roasting section is one of important working procedures, with the increasing requirement on environmental protection, the basic requirement on net emission of NOx emission is difficult to achieve at present, and a denitration method is usually adopted to reduce the NOx emission, so that the cost is increased, a plurality of devices are added, and other problems are easily caused. Therefore, the method can effectively reduce the generation of NOx under the condition of not adopting a denitration device, and is a technical problem which is urgently needed to be solved at present.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem the utility model provides a reduce nitrogen oxide's production device, the purpose is the initial concentration that reduces NOx among the combustion process, solves the problem that NOx emission exceeds standard from the source.

In order to solve the technical problem, the invention is realized as follows:

for reaching above-mentioned purpose the utility model relates to a reduce nitrogen oxide's apparatus that produces, including the cooling separator, the preheating separator, exhaust pipe and calcination main furnace, calcination main furnace upper portion is through first pipe connection preheating separator, flue gas entering preheating separator after the calcination main furnace burning, the cooling separator links together through combustion-supporting air pipeline and calcination main furnace, the combustion-supporting air of heat transfer that comes from the cooling separator passes through combustion-supporting air pipe connection in calcination main furnace bottom, be equipped with first branch road on the combustion-supporting air pipeline, first branch road introduces combustion-supporting air calcination main furnace upper portion, be equipped with the second branch road on exhaust pipe, the flue gas is sent to in the combustion-supporting air pipeline of calcination main furnace below through the second branch road.

And a pneumatic valve is arranged on the first branch.

The first branch is arranged at the upper part of the roasting main furnace in a ring pipe mode.

The first branch is provided with branch pipes inserted into the roasting main furnace, and the branch pipes are uniformly distributed on the first branch according to the circumference.

The first branch is arranged below the first pipeline.

The cross section area of the inlet to the outlet of the first pipeline is gradually reduced.

And the second branch is provided with a fan and a regulating valve.

The second branch is arranged at the smoke inlet end of the smoke exhaust pipeline.

The fan is arranged at the smoke inlet end of the second branch, and the regulating valve is arranged at the smoke outlet end of the second branch.

The utility model has the advantages of effect: the combustion-supporting air of the utility model enters the bottom of the roasting main furnace through the top outlet of the cooling separator through the combustion-supporting air flue to be mixed with the flue gas with extremely low oxygen content in the smoke exhaust flue, and then is combusted at the bottom of the roasting main furnace to be combusted in a negative oxygen state, the principle is that the air quantity required by combustion is controlled in the combustion process, the generation of NOx can be greatly reduced, and because the combustion-supporting air quantity is insufficient, so that the fuel is not fully combusted, the combusted gas enters the main roasting furnace, the fuel which is not fully combusted continuously generates combustion reaction with the combustion-supporting air entering the circular pipe at the upper part of the main roasting furnace, the opening of the pneumatic valve can be adjusted to control the smoke throughput, the burned smoke enters the preheating separator to continue reacting with the material, because the roasting main furnace is not fully burned, therefore, the temperature of the roasting main furnace can be effectively reduced, the generation amount of NOx is reduced, and the aim of environmental protection is fulfilled.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1. a cooling separator; 2. a combustion air conduit; 3. a pneumatic valve; 4. a ring pipe; 5. roasting the main furnace; 6. roasting the bottom of the main furnace; 7. adjusting a valve; 8. a fan; 9. a smoke exhaust duct; 10. a pre-heated separator; 11. a first conduit; 12. a second branch pipe; 13. and (4) branch pipes.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in the figure, the utility model relates to a reduce nitrogen oxide's apparatus that produces, including cooling separator 1, preheat separator 10, exhaust pipe 9 and calcination

main furnace

5, 5 upper portions of calcination main furnace are through first pipeline 11 connection preheat separator 10, flue gas entering preheat separator 10 after 5 burning of calcination main furnace, cooling separator 1 links together with calcination main furnace 5 through combustion-supporting air pipeline 2, the heat transfer combustion-supporting air who comes from cooling separator 1 passes through combustion-supporting air pipeline 2 and connects in calcination main furnace bottom 6, be equipped with first branch road on combustion-supporting air pipeline 2, first branch road introduces combustion-supporting air and roasts 5 upper portions of main furnace, be equipped with second branch road 12 on exhaust pipe 9, the flue gas is sent to in the combustion-supporting air pipeline 2 of 5 below of calcination main furnace through second branch road 12.

And the first branch is provided with a pneumatic valve 3.

The first branch is arranged in the form of a ring pipe 4 above a main roasting furnace 5.

The first branch is provided with branch pipes 13 inserted into the roasting main furnace 5, and the branch pipes 13 are uniformly distributed on the first branch according to the circumference.

The first branch is arranged below the first pipeline 11.

And the second branch 12 is provided with a fan 8 and a regulating valve 7.

The second branch 12 is arranged at the smoke inlet end of the smoke exhaust pipeline 9.

The fan 8 is arranged at the smoke inlet end of the second branch 12, and the regulating valve 7 is arranged at the smoke outlet end of the second branch 12.

Claims

1. The utility model provides a reduce nitrogen oxide's apparatus that produces, its characterized in that includes the cooling separator, the preheating separator, exhaust pipe and calcination main furnace, calcination main furnace upper portion is through first pipe connection preheating separator, flue gas entering preheating separator after the burning of calcination main furnace, the cooling separator links together with calcination main furnace through combustion-supporting air pipeline, the combustion-supporting air of heat transfer that comes from the cooling separator passes through combustion-supporting air pipeline and connects in calcination main furnace bottom, be equipped with first branch road on the combustion-supporting air pipeline, first branch road introduces combustion-supporting air in calcination main furnace upper portion, be equipped with the second branch road on the exhaust pipe, the flue gas is sent to the combustion-supporting air pipeline of calcination main furnace below through the second branch road in.

2. A nitrogen oxide reduction generator as set forth in claim 1 wherein said first branch is provided with a pneumatic valve.

3. The apparatus according to claim 2, wherein the first branch is arranged in the upper part of the main roasting furnace in the form of a loop.

4. A generator for reducing NOx as claimed in claim 3, wherein said first branch is provided with branch pipes inserted into said main roasting furnace, said branch pipes being circumferentially and uniformly arranged on said first branch.

5. A reduced nitrogen oxide generator as claimed in claim 2, 3 or 4, wherein said first branch is provided below said first conduit.

6. The apparatus according to claim 5, wherein the cross-sectional area of the first conduit decreases from the inlet to the outlet.

7. A device for reducing nitrogen oxides as claimed in claim 1, wherein said second branch is provided with a blower and a regulating valve.

8. A reduced nitrogen oxide generator as set forth in claim 7, wherein said second branch is provided at the inlet end of the flue gas duct.

9. The apparatus as claimed in claim 7, wherein the fan is disposed at the smoke inlet of the second branch, and the regulating valve is disposed at the smoke outlet of the second branch.